Wireless Electricity Charger

The Wireless Electricity Charger operates on the principle of resonant-inductive coupling to transfer power without physical contact. The circuit uses a DC power source, such as a USB cable or a 9V battery with a connector, to supply energy to a primary oscillator circuit. This active switching stage is driven by a BC-547 NPN transistor configured to rapidly switch current through a primary inductor coil made from the 0.3 to 0.4mm enamelled copper wire. The 1K resistor provides the necessary base bias for the transistor to sustain this oscillation. As alternating current flows through the primary copper wire coil, it generates a fluctuating magnetic field. When a secondary matching coil, also wound from the enamelled copper wire, is brought into proximity, this changing magnetic field induces an electromotive force (voltage) across the secondary coil via electromagnetic induction. Finally, this transferred electrical energy drives an LED to visually indicate successful power transmission.